US PATENT SUBCLASS 219 / 67
.~.~ Resistance heating methods

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
59.1  DF  .~ Of cylinders (e.g., pipes and tubes) {14}
67.~.~ Resistance heating methods

DEFINITION

Classification: 219/67

(under subclass 59.1) Resistance heating methods.